[ipv6-wg] New version (or followup) of RIPE-501 document...
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Ivan Pepelnjak
ip at ioshints.info
Mon Jun 20 14:30:34 CEST 2011
> On 06/20/2011 12:40 PM, Tim Chown wrote: > > I think load balancers should be included; I know some universities who > did not take part in W6D not because their web servers couldn't be made v6 > ready, but because their load balancers could not. > > Although the thread may deviate a bit, since we got into the topic of > load balancers, does anyone have any pointers or references to work > describing how load balancers can/should operate in an IPv6 environment? > > The reasons for asking are: > > - we need such references to include in RIPE-501 > - in the IPv4 world a lot of the load balancing logic has to do > with NAT. In IPv6, NAT should be a forbidden notion. Of course someone > could just terminate connections and open new ones in backend farms of > machines effectively acting as an application layer proxy. Getting more and more off-topic, but regardless of what purists might think, load balancing is a crucial function (until TCP stack and/or socket API get fixed - read: not likely) and at least some of them do and will use some sort of NAT to do their job. Of course those vendors that can do high-speed TCP termination (sometimes even in hardware) will tell you why that's infinitely better ... and the purists will be happy because you've replaced abhorred NAT with oh-so-much-better TCP relay ;) Unfortunately, the net result is the same - loss of direct end-to-end client-to-server connectivity. Just my mildly sarcastic view of the NAT-in-LB topic Ivan
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